How to use the dustjs-linkedin.insertLocalsFn function in dustjs-linkedin

Promise.all(promisesData).then(function() {
                // Open and render dust file
                var file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
                dust.insertLocalsFn(dustData ? dustData : {}, req);
                dust.renderSource(file, dustData || {}, function(err, rendered) {
                    if (err) {
                        console.error(err);
                        return res.status(500).end();
                    }

                    // Send response to ajax request
                    res.json({
                        content: rendered,
                        data: idSubentity || {},
                        empty: empty,
                        option: option
                    });
                });
            }).catch(function(err) {
                console.error(err);

Promise.all(promisesData).then(function() {
				// Open and render dust file
				const file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
				dust.insertLocalsFn(dustData ? dustData : {}, req);
				dust.renderSource(file, dustData || {}, function(err, rendered) {
					if (err) {
						console.error(err);
						return res.status(500).end();
					}

					// Send response to ajax request
					res.json({
						content: rendered,
						data: idSubentity || {},
						empty: empty,
						option: option
					});
				});
			}).catch(function(err) {
				console.error(err);

Promise.all(promisesData).then(function() {
                // Open and render dust file
                var file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
                dust.insertLocalsFn(dustData ? dustData : {}, req);
                dust.renderSource(file, dustData || {}, function(err, rendered) {
                    if (err) {
                        console.error(err);
                        return res.status(500).end();
                    }

                    // Send response to ajax request
                    res.json({
                        content: rendered,
                        data: idSubentity || {},
                        empty: empty,
                        option: option
                    });
                });
            }).catch(function(err) {
                console.error(err);

Promise.all(promisesData).then(function() {
            // Open and render dust file
            var file = fs.readFileSync(__dirname+'/../views/'+dustFile+'.dust', 'utf8');
            dust.insertLocalsFn(dustData ? dustData : {}, req);
            dust.renderSource(file, dustData || {}, function(err, rendered) {
                if (err) {
                    console.error(err);
                    return res.status(500).end();
                }

                // Send response to ajax request
                res.json({
                    content: rendered,
                    data: idSubentity || {},
                    empty: empty,
                    option: option
                });
            });
        }).catch(function(err) {
            console.error(err);

Promise.all(promisesData).then(function () {
            // Open and render dust file
            var file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
            dust.insertLocalsFn(dustData ? dustData : {}, req);
            dust.renderSource(file, dustData || {}, function (err, rendered) {
                if (err) {
                    console.error(err);
                    return res.status(500).end();
                }

                // Send response to ajax request
                res.json({
                    content: rendered,
                    data: idSubentity || {},
                    empty: empty,
                    option: option
                });
            });
        }).catch(function (err) {
            console.error(err);

Promise.all(promisesData).then(function() {
                // Open and render dust file
                var file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
                dust.insertLocalsFn(dustData ? dustData : {}, req);
                dust.renderSource(file, dustData || {}, function(err, rendered) {
                    if (err) {
                        console.error(err);
                        return res.status(500).end();
                    }

                    // Send response to ajax request
                    res.json({
                        content: rendered,
                        data: idSubentity || {},
                        empty: empty,
                        option: option
                    });
                });
            }).catch(function(err) {
                console.error(err);

Promise.all(promisesData).then(function() {
            // Open and render dust file
            var file = fs.readFileSync(__dirname+'/../views/'+dustFile+'.dust', 'utf8');
            dust.insertLocalsFn(dustData ? dustData : {}, req);
            dust.renderSource(file, dustData || {}, function(err, rendered) {
                if (err) {
                    console.error(err);
                    return res.status(500).end();
                }

                // Send response to ajax request
                res.json({
                    content: rendered,
                    data: idSubentity || {},
                    empty: empty,
                    option: option
                });
            });
        }).catch(function(err) {
            console.error(err);

Promise.all(promisesData).then(function() {
            // Open and render dust file
            var file = fs.readFileSync(__dirname+'/../views/'+dustFile+'.dust', 'utf8');
            dust.insertLocalsFn(dustData ? dustData : {}, req);
            dust.renderSource(file, dustData || {}, function(err, rendered) {
                if (err) {
                    console.error(err);
                    return res.status(500).end();
                }

                // Send response to ajax request
                res.json({
                    content: rendered,
                    data: idSubentity || {},
                    empty: empty,
                    option: option
                });
            });
        }).catch(function(err) {
            console.error(err);

Promise.all(promisesData).then(function() {
                // Open and render dust file
                var file = fs.readFileSync(__dirname + '/../views/' + dustFile + '.dust', 'utf8');
                dust.insertLocalsFn(dustData ? dustData : {}, req);
                dust.renderSource(file, dustData || {}, function(err, rendered) {
                    if (err) {
                        console.error(err);
                        return res.status(500).end();
                    }

                    // Send response to ajax request
                    res.json({
                        content: rendered,
                        data: idSubentity || {},
                        empty: empty,
                        option: option
                    });
                });
            }).catch(function(err) {
                console.error(err);

return new Promise(function (resolve, reject) {
        options.data.staticImagePath = __dirname + '/../public/img';

        var dustSrc = fs.readFileSync(options.file, 'utf8');
        dust.insertLocalsFn(options.data ? options.data : {}, options.req);
        dust.renderSource(dustSrc, options.data, function (err, html) {
            if (err)
                return reject(err);

            var tmpFileName = __dirname + '/../' + new Date().getTime() + '' + (Math.floor(Math.random() * Math.floor(100))) + '.pdf';

            var headerStartIdx = html.indexOf('');
            var headerEndIdx = html.indexOf('', headerStartIdx + (''.length)) + (''.length);
            var header = html.substring(headerStartIdx, headerEndIdx);

            var footerStartIdx = html.indexOf('');
            var footerEndIdx = html.indexOf('', footerStartIdx + (''.length)) + (''.length);
            var footer = html.substring(footerStartIdx, footerEndIdx);

            pdf.create(html, {
                orientation: "portrait",